Actuating mechanism for car-brakes.



PATENTED MAY 29, 1906.

E. I. Bonus.

AGTUATING MECHANISM FOR GAR BRAKES.

APPLICATION FILED SEPT.1B.1906.

2 SHEETS-SHEET 1.

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No. 821,616. PATENTED MAY 29, 1906.

E. I. DODDS.

AGTUATING MBGHANISM FOR GAR BRAKES.

APPLICATION FILED SBPT.1B.1905.

2 SHEBTSSHEET 2 'UNITED STATES PATENT OFFICE.

ETHAN I. DODDS, OF PULLMAN, ILLINOIS, ASSIGNOR TO THE PULLMAN COMPANY,OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ACTUATING MECHANISM FOR CAR-BRAKES.

Specification of Letters Patent.

Patented May 29, 1906.

Application filed September 18, 1905. Serial No.278,929.

T on whom it may concern:

Be it known that I, ETHAN I. Donns, a citizen of the United States,residing at Pullman, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Actuatin Mechanisms forOar-Brakes, of which the fo lowingis a specification. I

To provide a brake-operating mechanism to which shall occupy smallspace, requiring but little, if any, lubrication, and be neatly housedor incased, I have invented a clutch and cooperating parts suitable forsuch purpose, the clutch mechanism being within an I 5 integral casingon the brake-handle.

In the accompanying drawings I have illustrated one embodiment of myinvention, like reference characters on all the figures referring to thesame parts.

Figure 1. is an elevation of my improved brake-actuating mechanism,partly in section. Fig. 2 is a section of the device illustrated in Fig.1 on the line 2 2 as viewed in the direction indicated by the arrows.Fig. 3 25 is a section of the device shown in Fig. 1 on line 3 3 asviewed in the direction indicated by the arrows; and Fig. 4 is aperspective view, on an enlarged scale, of a portion of the partsconstituting the actuating mechanism.

designates the usual vertical brakeshaft, which is rotatably mounted inthe carplatform 11 and in a brace or bracket 12, a brake-shoe-operatingchain 13 being secured to thelower end of the shaft and adapted to 35 bewound around the shaft as the latter is turned. Just above the platformor floor 11 the shaft 10 is supplied with the usual ratchetwheel 14 anddetent dog or pawl 15, the latter being pivoted at 16. The upper end of40 the shaft is shouldered at 17, Fig. 4, the extreme upper end of theshaft being threaded at 18, and the shaft being also provided with akeyway 19 for a portion of its length. The brake-handle 20 has at itsinner end an in- 45 tegral cylindrical casing 21, having a top 22 with acentral aperture 23, the under side of said top being provided withradially-extend- 1 ing teeth 24. The mouth of the casing at its lowerend is internally threaded, as shown at 5 25, while aninwardly-projecting key or feather 26 extends longitudinally of theinterior of the casing, asshown in Figs. 1 and 4. At 27 the'inner'wallof the casing or housing is supplied with a semicylindrical threadedrecess. A disk 28, having a thread ed periphery 29, is adapted to enterthe lower end of the casing, closing the entrance to the same throughscrewthreaded engagement with the threads 25. Teeth 30, similar to thoseon the top wall of the casing, are provided on the upper surface of thedisk 28, while a cylindrical boss or sleeve 31 projects from the otherside of the latter, said disk being centrally apertured in line with thebore of said sleeve, whereby it is mounted on the shaft 10. When thedisk 28 has been screwed into the mouth of the casing, a short screw 45,Fig. 1, is inserted in the internallythreaded hole formed by thesemicylindrical recess 27 and a similar registering recess 32 on theperiphery of the disk 28, acting as a key to prevent the latter fromunscrewing and positioning the teeth 30 opposite the teeth 24.

Between the member 28 and the top of the handle-casing 21 are placed twocamdisks 33 and a plurality of friction-disks 34 and 35, each cam-disk33 being supplied on one face with a plurality of cam-teeth 36, whichcooperate with the projections or teeth 24 and 30. Each cam-disk has acentral circular aperture 37, adapted to fit the shaft 10, and a notch38 in its periphery loosely engaging the key 26 with capacity for alimited playlaterally of the latter. Any number of friction-disks 34 andmay be used, although I have shown but one of each in Fig. 4, while inFig. 1 I have illustrated four of the former and three of the latter.Disks 35 are centrally apertured at 39, so as to fit the shaft, and eachhas a recess 40 in its edge which slidingly engages the key 26, butwithout lateral play. The cylindrical frictiondisks 34 have each acircular central aperture 41 to fit the shaft and also aninwardlyprojecting key 42 to engage the keyway 19 of the shaft. It willbe seen from this that the fricton-disks 35 turn with the handle, thefriction-disks 34 turn with the shaft, and the cam members 33 turn withthe handle, with which theyhave, however, a loose or lost-motionrotative engagement.

When all the parts are in place, the top 22 of the'handle-casing engagesthe shoulder 17 of the shaft, being held therea ainst by a nut 43engaging the threaded en of the shaft,

and pin 44 to prevent its becoming loose. The member 28 is screwed intothe mouth of the casing and keyed therein by the small screw 45. Theteeth 30 of the member 28 cooperate with the downwardly-extendedcam-teeth 36 of the lower cam member 33, and the teeth 24 of the casingcoact with the upwardly-projecting cam-teeth 36 of the upper cam-disk33. Between the two members 33 are the plurality of friction-disks 34and 35, the former of which turn on the shaft, while the latter turnwith the casing-handle.

The operation of the device is as follows: With the parts assembled, asabove described, when the handle 20 is turned in a clockwise directionthe teeth 24 and 30 ride over the inclined sides of the cam members 33to the extent permitted by the lost-motion play of the notches 38relatively to the key 26, this being sufficient to squeeze thefriction-disks together sufficiently to effect a holding engagementbetween the handle and shaft, after which on a continued rotation of thehandle the parts all turn together. During the initial forward movementof the handle the friction between the cam-disks 33 and the adjacentfriction-disks is sufficient to prevent the cam-disks from rotating asthe teeth 24 and 30 ride up the inclined sides of the cam-teeth pressingthe cams toward each other. When it is desired to retract the handle tosecure a more favorable position for its operation, it is rotatedcontra-clockwise, and owing to the lost motion between the handlecasingand the cam-disks 33 the teeth 24 and 30 can slide down the cam-surfacesufiiciently to release the frictional engagement between thefriction-disks, thus permitting the camdisks and the friction-disks 35to turn backward, while the friction-disks 34 remain fixed relatively tothe shaft, the pawl and ratchet 15 and 14 meanwhile holding the shaftagainst backward turning.

My invention is not limited to the details of construction describedabove, and for that reason it' is not restricted to the specificfeatures shown and described except to the extent that they are made thesubject-matter of s ecific claims.

T 's atent is intended to embrace only so much 0 the disclosure madeherein as is covered by the claims.

I claim 1. In a device of the character described, the combination of ashaft, a handle therefor, cooperating friction devices carried by saidshaft and handle, respectively, and means for forcing said frictiondevices into holding engagement as said handle is turned, substantiallyas described.

2. In a device of the character described, the combination of a shaft, arotatable handle therefor, friction devices non-rotatable relatively tosaid handle and shaft, respectively, and means for forcing said frictiondevices into holding engagement on the forward movement of said handle,substantially as described.

3. In a device of the character described, the combination of abrake-shaft, a rotatable handle therefor, friction devices non-rotatablerelatively to said handle and shaft, respectively, means for forcingsaid friction devices into holding engagement on the forward movement ofsaid handle, and means to prevent backward movement of said brakeshaft,substantially as described.

4. In a device of the character described, the combination of a shaft,one or more .friction-disks movable with said shaft, a shaftoperatingdevice, one or more friction-disks movable with said shaft-operatingdevice, and means serving to force said friction-disks together tosecure an operative frictional connection between said shaft-operatingdevice and shaft as the former is actuated, substantially as described.

5. In a device of the character described, the combination of abrake-shaft, one or more friction-disks movable with said shaft, a r0-tatable brake-handle, one or more frictiondisks movable with saidbrake-handle, means serving to force said friction-disks together tosecure an operative frictional connection between said handle and shaftas the former is turned forwardly, and means to prevent backward turningof said shaft, substantially as described.

6. In a device of the character described, the combination of abrake-shaft, a rotatable brake-handle, friction devices movable withsaid shaft, other friction devices movable with said handle, cam devicesserving to force said friction devices into holding engagement with eachotheras said handle is turned forwardly, and means to prevent backwardturning movement of said shaft, substantially as described.

7. In a device of the character described, the combination of a shaft,one or more friction-disks movable with said shaft, a handle, one ormore friction-disks movable with said handle, and cam devices operativeupon a forward turning movement of said handle to force saidfriction-disks together and secure an operative frictional connectionbetween said handle and shaft, substantially as described.

8. In a device of the character described, the combination of abrake-shaft, one or more friction-disks movablewith said brake-shaft,

a rotatable brake-handle, one or more fric tion-disks movable with saidhandle, cam devices serving to force said friction-disks together assaid handle is turned forwardly, and means to prevent backward movementof said shaft, substantially as described.

9. In a device of the character described,

the combination ofv a shaft, operating means therefor, a friction devicemovable with said shaft, a friction device movable with said operatingmeans, a cam slidable on said shaft, and means actuated by saidshaft-operating means cooperating with said cam to force said frictiondevices into holding engagement with each other, substantially asdescribed.

10. In a device of the character described, the combination of abrake-shaft, a rotatable brake-handle, a friction device movable withsaid brake-shaft, a friction device movable with said brake-handle, acam slidable on said shaft, means on said handle cooperating with saidcam to force said friction devices together as the handle is turnedforwardly, and means to prevent backward movement of said shaft,substantially as described.

11. In a device of the character described, the combination of a shaft,a shaft-operatin means, a friction device movable with sai shaft, afriction device movable with said shaft-operating means, a cam slidableon said shaft and having a lost-motion connection with said operatingmeans, and means actuated by said operating means cooperating with saidcam to force said friction devices to gether on the forward turningmovement of said shaft-operating means, substantially as described.

12. In a device of the character described, the combination of abrake-shaft, a rotatable handle therefor, one or more friction-disksmovable with said shaft, one or more frictiondisks movable with saidhandle, a cam slidable with said shaft and having a lost-motionconnection with said handle, means actuated by said handle coacting withsaid cam when said handle is turned forwardly to force saidfriction-disks together, and means to prevent backward movement of saidshaft, substantially as described.

13. In a device of the character described, the combination of a shaft,a handle therefor, one or more friction-disks movable with said shaft,one or more friction-disks movable with said handle, a disk slidablymounted on said shaft and provided with a camsurface, and a projectionon said handle adapted, on the forward movement of the handle, tooverride said cam-surface and force said friction-disks into holdingengagement with each other, substantially as described.

' 14. In a device of the character described, the combination of abrake-shaft, a rotatable brake-handle, one or more frictiondisks movablewith said shaft, one or more frictiondisks movable with said handle, apair of disks having cam-surfaces slidably mounted on said shaft aboveand below said friction disks, respectively, projections on said handleadapted to override said cam-surfaces and thereby force said disks uponsaid friction-disks on the forward movement of said handle, and means toprevent backward rotation of said shaft, substantially as described.

ETHAN I. DODDS.

Witnesses:

WALTER M. FULLER, FREDERICK O. Goonwnv.

